fits model: Miata, Street. make: Mazda. year: 1991.

( Brand: Act ), ( Type: Transmission Clutch Kit ), ( Manufacturer Part Number: ZM1-HDSS ), ( Performance Part: Yes ), ( UPC: 842385020705 )
The ACT Advanced Clutch Kit ZM1-HDSS is a superior upgraded clutch solution designed specifically for 1991 Mazda Miata HD (High Performance Street Sprung) models. This clutch kit is an excellent choice for Miata enthusiasts seeking improved performance, durability, and a more engaging driving experience.
This ACT kit includes a high-performance, heat-treated, 11.5-inch clutch disc made from lightweight and strong materials. The disc's unique design features a high friction organic material that provides consistent clutch pedal feel, better bite, and superior heat resistance. In comparison to OEM clutches, this upgrade delivers excellent drivability and smoother engagement, ensuring a more thrilling driving experience.
Incorporated in this kit is the HD pressure plate, which is an essential component of the clutch system. The HD pressure plate features an upgraded diaphragm spring design that applies even clamping force, helping to ensure a more positive and consistent engagement. This durable component not only enhances the clutch pedal feel but also prolongs the life of the flywheel.
A key selling point of the ACT Advanced Clutch Kit ZM1-HDSS is its innovative sprung hub design. Unlike traditional single-piece hubs that can warp under heavy loads, the ACT's sprung hub design provides optimal clamping force and eliminates the need for heavy flywheel weights. This makes the clutch more effective, efficient, and contributes to enhanced drivability.
This kit also includes a flywheel that is specifically tailored to the Miata's power output, ensuring optimal clutch performance. The flywheel's unique design provides better torque transfer, which significantly enhances the overall power delivery across the power band. Additionally, the Flywheel features a snout extension design that ensures proper alignment with the transmission input shaft.
The ACT Advanced Clutch Kit ZM1-HDSS is an ideal choice for Miata enthusiasts seeking a high-performance clutch upgrade that will stand up to the demands of regular track use and high horsepower applications while providing improved drivability and consistency. This kit's components have been rigorously tested to ensure a perfect fitment, ease of installation and reliable operation, giving Miata owners peace of mind and an unforgettable driving experience.
The ACT Advanced Clutch (zm1-hdss) is a popular upgrade among Miata enthusiasts for its enhanced clamping force and durable design. However, this upgrade comes with its advantages and disadvantages that every potential buyer should consider carefully.
Pros:1. Improved Clutch Performance: The ACT Advanced Clutch offers superior clamping force compared to the stock clutch, reducing slippage and providing smoother engagement.
2. Increased Torque Capacity: With a higher torque capacity, this clutch can better handle the power increased by performance modifications.
3. Enhanced Heat Resistance: The club has a higher heat capacity, allowing it to handle the heat generated during aggressive driving.
4. Durable Material: The ACT Advanced Clutch uses clutches made of high-performance materials, ensuring better wear resistance.
5. Reduced Engine Revs: A more efficient clutch engagement can result in lower engine revs during take offs and shifts, ultimately saving fuel and reducing engine wear.
Cons:1. Cost: The ACT Advanced Clutch is more expensive than the stock clutch, as it is a high-performance upgrade.
2. Installation Complexity: Installing the ACT Advanced Clutch can be challenging for those without experience in automotive performance enhancements. Professional installation is recommended.
3. Pedal Pressure: The increased clamping force may require more pedal pressure, which might be uncomfortable for some drivers.
4. Shift Quality: While better clutch engagement can result in smoother shifts, the exact shift quality also depends on other factors, such as synchronizers and transmission condition.
5. Noise: This high-performance clutch may generate more noise compared to the stock clutch, which might not be desirable for some drivers.
Conclusion:The ACT Advanced Clutch (zm1-hdss) offers several advantages, including improved clutch performance, enhanced heat resistance, increased torque capacity, and durable materials. However, it also has disadvantages like increased cost, installation complexity, required pedal pressure, potential shift quality changes, and potential increased noise. Overall, if you are someone seeking efficient power transfer, aggressive driving, or undergoing performance modifications, the pros of this clutch installation might outweigh the cons. Splitting opinions exist, and it is essential to weigh the benefits against the consequences before making a decision.
Recommendation:For those race-oriented enthusiasts planning performance modifications on their 1991 Mazda Miata or wanting to enhance their driving experience, the ACT Advanced Clutch (zm1-hdss) represents an excellent choice. As a high-performance upgrade, it addresses many aspects that stock clutches cannot. However, novice enthusiasts and daily drivers might not derive significant benefits and may prefer to stick to the stock clutch for reasons of cost-effectiveness and ease of use. Regardless of the decision, it's always advisable to consult a professional mechanic or performance specialist for personalized advice.
Manufacturer: ACT Advanced Clutch, Part Number: ZM1-HDSS, condition: New: ZM1-HDSS kit features Acts most popular Heavy Duty pressure plate and Street disc. These discs have reduced Marcel for faster shift Action to complement ACT pressure plates, with increased strength and reliability. ACT Heavy Duty pressure plates use exclusive diaphragm design to increase clamp load, reduce deflection and maximize clutch life. All diaphragms endure a four-stage, heat-treating process for unparalleled performance.
Acts Performance Street discs feature premium organic materials with high copper content for better heat transfer and steel-backed lining greater burst strength durability.